- Better music
- Better SFX
- Missions support (see the list)
- Course improvements
- MKDD karts have been removed and replaced by original MKDS karts with their corresponding beta models (except Toad Kart, which was used in the E3 2004 version as the standard kart)

Uh... this doesn't work on all flashcards, but works on some R4s, as reported by many who played this hack. I don't get why this happens, but you can try using NSMBe to extract all the files from the ROM (only the ones in the /data is recommended), and put them on a clean ROM.

It worked just fine in my r4i 3d 2012 until i pressed Single Player and freeze on a black screen. It still didnt get ingame without crashing in any of my flashcard so i guess your hack is only playable in a very limited number of flashcards